Marquis by Kingsman 4x7 inch Diameter by 8 Feet Flex Vent Kit ZDVFK84x7 inch Diameter by 8 Feet Marquis by Kingsman Flex Vent Kit ZDVFK58 Product Details The Kingsman flex ventilation material adapts to tight spaces and corners and allows you more freedom with the placement of your stove. This kit includes a flex kit with 4 and 7 inch diameters with an 8 foot length, springs, screws, and mill pac to help you complete your installation. Features: Flex Vent 5 8 20 Foot Length Spring, Screws, and Mill Pac Included Works